bridge Untagged packets on an interface

[Julian Elischer]

On 5/3/14, 4:59 AM, Özkan KIRIK wrote:
> And also i tried ng_bpf + ng_eiface conjuction, but ng_bpf doesnt match
> "vlan" filter.
>
> With the script below, ng_bpf always calls ifNotMatch hook.   When the
> pattern is "ip", ng_bpf matches frames have both vlan and ip headers.
> I think ng_bpf doesnt process ethernet header.  Is there a way to process
> ethernet header with ng_bpf ?

once you have worked out what the framework is doing then it is very 
easy to read the code of netgraph modules
because each module does only one thing.
read the sample module for descriptions of what the parts do and then 
look at the modules you are trying to use.
it should be pretty quickly obvious what they are doing.

Julian

>
> Script is below:
>
> #!/bin/sh
> ETHER_IF=em0
> PATTERN="vlan"
> BPFPROG=$( tcpdump -s 8192 -ddd ${PATTERN} | \
>                      ( read len ; \
>                        echo -n "bpf_prog_len=$len " ; \
>                        echo -n "bpf_prog=[" ; \
>                        while read code jt jf k ; do \
>                            echo -n " { code=$code jt=$jt jf=$jf k=$k }" ; \
>                        done ; \
>                        echo " ]" ) )
>
> echo $BPFPROG
>
> # Shutdown nodes if exists
> ngctl shutdown ${ETHER_IF}:
> ngctl shutdown vlan_filter:
> ngctl shutdown tag0:
> ngctl shutdown untag0:
>
> ngctl -f- <<EOF
> mkpeer ${ETHER_IF}: bpf lower filter_in
> name ${ETHER_IF}:lower vlan_filter
> mkpeer vlan_filter: eiface taggedPacket ether
> mkpeer vlan_filter: eiface untaggedPacket ether
> name vlan_filter:taggedPacket tag0
> name vlan_filter:untaggedPacket untag0
> msg vlan_filter: setprogram { thisHook="filter_in" ifMatch="taggedPacket"
> ifNotMatch="untaggedPacket" $BPFPROG }
> EOF
> ifconfig ngeth0 up
> ifconfig ngeth1 up
>
>
>
> On Fri, May 2, 2014 at 11:53 PM, Özkan KIRIK <ozkan.kirik at gmail.com> wrote:
>
>> Hi,
>>
>> Assume that default vlan untagged and VLAN 10, 20, 30, 40 tagged on switch
>> connected to em0 interface.
>>
>> i am trying to bridge only untagged frames on em0 with em1.
>>
>> Does if_vlan handle untagged frames?
>>
>> # ifconfig em0.0 create
>> ifconfig: SIOCIFCREATE2: Invalid argument
>>
>> Any ideas?
>>
>> Best regards,
>>
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